質問編集履歴
1
各モデルのリレーションを追記しました！
test
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test
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group.rb↓
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```
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class Group < ApplicationRecord
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has_many :group_users
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has_many :users, through: :group_users
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has_many :messages
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end
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```
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```
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class Message < ApplicationRecord
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belongs_to :user
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belongs_to :group
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end
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user.rb↓
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class User < ApplicationRecord
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has_many :group_users
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has_many :messages
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has_many :groups, through: :group_users
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end
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```
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group_user.rb↓
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```
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class GroupUser < ApplicationRecord
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belongs_to :group
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belongs_to :user
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end
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```
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